Retrieves a row from a 3x3 matrix.
Original signature is 'GLKVector3 GLKMatrix3GetRow ( GLKMatrix3 matrix, int row );'
Available in OS X x0.8 and later.
public static GLKVector3 GetRow (GLKMatrix3 matrix, int row) { GLKVector3 v = new GLKVector3 (matrix [row], matrix [3 + row], matrix [6 + row]); return v; }